Method of and means for freeing jammed earth-boring columns



Jan. 29 1924. 1,4821 63 J. STREDA METHOD OF AND MEANS FOR FREEING JAMMEDEARTH BORING COLUMNS Filed Dec 4, 1922 lt m'mm i 7 3 l a r '1 Mfr! /a 45 1 l 6 8 in 8 f/wenforz Patented Jan. 29, 1924.

p gTgDj STATES meals Persian" oFF cE.

JOSEPH STREDA, .OF LONDON, ENGLAND.

METHOD or AND MEANS roe rsnnrns JAMMED EARTH-BORING. COLUMNS.

Application filed lieccmber siesta. Serial No. 604,947.

To a]! w/tom it may concern. I

Be it known that L JosErn STREDA, a citizen of the CzechoslovakianRepublic, re siding at London, England, have invented a certain Methodof and Means for Freeing dammed Earth-Boring Columns, of which thefollowing is a specification.v

In the boring of petroleumfand like wells,

it sometimes happens that, the boring column gets jammed in thesurroundin sand or like strata and defies removal. T he object of thepresent invention is to provide means for the freeing of such columns,and the invention consists in subjecting the column to the simultaneouseffect of pressure and percussion, while in some .cases a jammed columnmay also be filled with liquid by wayof facilitating the loosening ofthe earth. i 1

Fig. 1 of the drawings represents a side view of the device whereby themethod may be carried into effect, and

Fig. 2 is a view at'right angles to Fig. 1,

and showing a slightly modified arrangement.

The figures show the'surface part of the boring column which is in thiscase composed of three concentric pipes 1, 5 and 8. The outer pipe is a.rivete d one and it is supported on joists 4: by means of clampingcollar 3, the latter being applied to the pipe immediately beneath theconnecting sleeve 2. On this sleeve rests another clamping collar 7which isapplied to the next pipe 5 beneath a sleeve 6. The pipe 5 isseamless and is screwed into the sleeve 6. The inner pipe 8 is the onewhich is jammed and which is therefore to be subjected to the freeingprocess. For this purpose another pipe 10 of the same size is connectedthereto by means of a sleeve 9. The pipe 10 passes between ioists 22 and23 through the floor 21 of the boring tower. Planks 40, arranged abovethe floor at opposite sides of the pi pc and t right angles to thejoists, are clamped to the latter by means of screw bolts. The planks4:0 serve as abutments for hydraulic pistons 29 the cylinders 29 ofwhich are used for applying pressure to the pipe 10. According to Fig. 1the cylinders are supported on the pipe 10 by means of a dog 241 whichis secured to the pipeby means of wedges 25 inserted from below. A pieceof wood 26, a metal plate 27 and a sheet 28 of some flexible materialare interposed one after the other between the dog and each cylinder.Similar paddings are interposed between the pistons and the planks 10.

According to Fig. 2, the do is replaced by two superposed sets of planis 34 and 35 arranged at right angles to one another and clamped to thepipe 10 by means of screw bolts.

A sleeve 11, screwed on the upper end of the pipe 10, carries an anvilhead 12. This head is fitted with hooks13 which, in the arrangementshown in Fig. 2, are connected by rods 38 to the lanks 3 1 and 35 so asto communicate the pressure on the latter partly to the top end of thepipe. Each rod 38 has at one end a shackle 39 whereby it is connected tothe hook 13, the other end being eyed and connected by means of abolt"-7 to a. forked screw-bolt 36 holding the planks. A centralaperture is provided in the head 12 throughwhieh a rod 17 is admittedinto the boring column.' This rod carries at the lower enda chisel 18and at the upper end a union by means of which it is connected to acable 16,. the latter being used in'knOWn manner for raising anddropping the rod. Acollar 19 which is clamped by meansof screws 'to therod 17 strikes against the head 12 when the rod drops and transfers theimpact to the pipe 10. To support the pipe 10, after it has been freedand to reduce the shock if the pipe should drop, two buffer-heads 33with springs 32 are arranged on the planks 10, the pipe be ing furnishedwith a collar 14 for abutment against the buffers. A pipe supplies waterunder pressure to the hydraulic cylinders, and a pipe 31 leads off thedis charge.

For the freeing of a jammed column there should be a free spaceunderneath it, and if not already in existance it should be formed byboring. Then the ammed column is filled with liquid, such as clayeywater, which doesnot form any deposits. In the absence of clayey waterpetroleum may be used. A considerable pressure is set up by the liquidat the bottom of the bore-hole, and the liquid penetrates the strata andforces an upward passage between the earth and the column. Meanwhile thehydraulic press is erected and pressure, which must not overtax theresistance of the pipe, is applied to the latter. After a certainpressure has been obtained, the percussion rod 17 is set in motion. Thevertical 1y directed blows set up vibrations which exfew strokes. up anddown tocomplete .the 1 operation. Theother pipes, if also jammed, maybefreed in the same manner,-the ,deep est, pipe being treated first.

ln some cases the freeing of they pipes may be effected Without the useof liquid.

In .cases. where .water has to be excluded from the. bore hole, thedevice may conveniently be used-for boring purposes. In thiscasearatherdeep anditruly cylindrical hole support so,as;to transfer part ofthe pressure tosaid headpa percussion rod guided is boredin advance inthe .usualmanner and the pipe left somedistance downthe hole.

l .draulic ress'ur'e -is then a liedto thev I i y p pp percussion rodso. as to: strike, against the column until it: sinks into the hole...After some sinklngthe hole 1s. clearedoutwhereeuponpressure-,is againapplied: to the column.- When pressure is no moresuflicient for sinkingthe column, pressure and per cussion may be used alternately. In thismanner great depthsmay be attained with a 7 space below the lowest endof the column, fillingthe j ammedcolumn with a liquid and thensubjecting such column to simultaneous downward pressure and percussion.

3. A device for. freeing jammed earth boring columns, comprising a pairof hydraulicpresses, a rigid support for the pis- .tions of suchpresses, means for supporting the cylinders ofsaid presses on the jammedpipe for exerting downward pressure thereon, andmeans for 'drivingthe.pipe by percussion, While the pressure 4:. A device, for freeing jammedearth boringcolumns, comprising a pair: of hydraul c presses,.a rigidsupport for the pistons of such presses, a cylinder support secured tovthe jammed column for transmittingpressure to the .same, a head securedto the npper end. of .the jammed column, rods connecting said.head withthe cylinder in said head, and a collar connected to the head ,for,vibrating the column.

5. A. device for freeing. jammed earth boring columns,comprising a pairof hydraulic presses, a rigid support for the pistonsof such presses, acylinder support'secured tothe .jammedcolumn for transmitting pressureto the same, a head secured to the upper .end of the jammed column, rodsconnecting said head with the cylinder support so as to transfer part ofthe pressure to;said head, a percussion rod guided in sa i d.head,.a.collar. connected to the percussion rodso to strike against thehead for vibratingthe column, a collar connected to the upper part-oftle jammed column, and buffers mounted on t e piston support so as to takeup the support of the sinking column by abutment against saidlattercolumn,

JOSEPH STREDA.

1s applied.

